Carburetor-choker control



' ure 1.

Patented etc 2, 1828 si ar re oannunnron-ononnn conrnon Application filed November 4, 1927. Serial No. 231,138.

This invention relates to a carburetor choker control, the general object of the 1nvention being to provide automatic means for controlling the openingzmmovement of the choker valve in such a manner as to secure the most efiicientresults at the starting of an internal combustion engine by giving it the proper mixture from the starting vof the motor to the point where it is running under normal conditions.

' Another object of the invention is to so arrange the partsthat the atmospheric temperature will regulatethe operatlon of the device so that the colder the day, the longer the choker will take to close and vice versa.

Another object of the invention is to provide means for adjusting the parts to set them at the most eflicient points.

This invention also consists in certain other features of construction and in the comb nation and arrangement of the several parts, to

be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention indetall, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a diagrammatic sectional view showing the invention applied to the choker of a motor vehicle.

Figure 2wis a section on line 2-2 of Fig- Figure 3 is a section on line 3-3 of Figure 2.

Figure 4 is a detail view showing the adjusting means for the lowerspring.

In these views, the numeral -1 indicates a cylinder which has its lower end closed and to which is connected a rod 3, the hooked end of which is connected with the arm4 of the choker valve. The upper end of the cylinder is closed by a cap 5 and a plug 6 is associated with this end of the cylinder so that oil or the like can be placed-inthe cylinder. A erforated ear 7 projects from the under si e of the top part of the cylinder and a rod 8 passes through. the perforation in this ear and through the dash 9 andinstrument board 10 of the vehicle.

on the upper end of the rod between the instrument board and a projection 13 on said rod and tends to hold the rod with its knob 14 against the instrument board.

An elongated hollow piston 15 is arranged in the cylinder with its upper end pointed and fastened to a piston rod 16 which passesv through the cap 5 and through a hole in the bracket 17 attached to the dash. A pair of, nuts 18 is threaded to the upper end of the piston rod to one side of the bracket and a second pair of nuts 19 is threaded to the rod. on the opposite; side of the bracket so that by adjusting the two pairs of nuts, the amount of movement of the rod and piston can be regulated. Perforations 20 are formed in the upper pointed end of the piston and an opening 21 is formed in the lower end thereof, this latter openlng being controlled by a ball valve 22 which opens inwardly.

From the foregoing it Will be seen that by pulling upon the knob 14 of the rod 8, the

nuts 11, striking the ear 7 will cause the cylnder 1 to move with the rod and as said cyllnder 1s attached to the choke valve, said valve -will'be closed if the choker rod 8 is moved upwardly or outwardlyto its full extent. On

the first part of the upward movement ofthe into the upper part of the cylinder. After the motor has started, the choker is released and the spring 12 will return the rod 8 to its normal position, the rod simply passing through the perforation in the ear 7 during this movement.

A spring 23 has one end attached to the closed end of the cylinder 1 and its other end is adjustably connected with a part of the carburetor, and as soon as the'chokerrod is vreleased, this spring tends to move the cylinder 1 downwardly or to a position where the choker valve will be opened. This spring will move the parts downwardly quickly until the nuts' 19 on the piston rod strikethe- Nuts 11 are threaded on the lower end of the rod and a spring 12 is placed bracket 17, when further movement of the piston 15 will be prevented and said piston, with the oil in the cylinder, willcheck the downward movement of the cylinder under the action of the spring 23, as a vacuum will. be created in the lower partef the cylinder by the piston, which vacuum is slowly broken by the oil in the top of the cylinder passing by the piston and entering the lower part of the cylinder. This oil'cannot pass through the piston on account ofthe check valve 22. Thus the choker valve will be opened to a slight extent very quickly after the choker rodv is released, but then the opening movement of the choker valve will be retarded by the action of the cylinder and the iston. Thus the engine will have time to before the choker valve reaches ful y.open position. As will be seen, the device is arranged close to the body of the engine and the more quickly more quickly the oil in the device will be heated which, of course, acts vto thin the oil and makes it flow morerapidly so that the device will work quicker after the engine has warmedup than it will when the en ine is cool. The same,efl'ect Will be'caused y atmospheric temperatures as the colder the day, the more sluggish the oil will flow so that the chokerwill take a longer time-to open on a cold day than itwill on a warmer day, The time ofopening of the choker valve can also be regulated by adjusting the parts through means of the nuts 18 and 19 and the spring 23.

It is thought from the foregoing description that the advantages and. novel features ofmy invention will be readily apparent,

I desire it to be understood that I may make changes in the construction and in the comick. up

the engine heats up, the

binat-ion and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim isi-. v 1. A choker device ator an internal combustion engine comprising a cylinder connected with the choker valve, means fornormally holding the cylinder in a position with thevalve open, a choker rod for moving the cylinder to close the valve, a piston in the cylinder having its rod connected with a stationary art, fluid in the cylinder and valve means der, a valve rod connected with the piston and passing through a stationary part, nuts on the valve rod for limiting its movement in the stationary part; and to provide a s ecific partly open position of the choker, oil in the cylinder covering the piston, the ends of the piston having openings therein for the pas sage of the oil and an inwardly opening valve for closing the lower openin f v In testimony whereof I afl ix my signature.

ROBERT GALBRAITH RUSSELL. 

